Those 6 Digits on Your Gold Tell You If It's Real

That tiny, almost unreadable stamp on the inside of your bangle is doing more work than you think. Since 1 April 2023, no jeweller in India can legally sell hallmarked gold jewellery without a 6-digit alphanumeric HUID — the Hallmark Unique Identification number. It is the single most useful thing a buyer can learn to read, because it turns a leap of faith at the counter into a 30-second check on your phone.

Most of us still buy gold the old way: trust the family jeweller, weigh it, pay, walk out. That works until it doesn't — until a resale valuation comes back lighter in purity than the bill claimed, or an heirloom turns out to be 18K sold as 22K. The HUID system was built precisely to close that gap, and the tool to use it is free.

What a real hallmark looks like now

Forget the cluttered old stamp with four separate symbols. A current, valid hallmark carries exactly three marks, and you should be able to spot all three with a jeweller's loupe or even a phone camera zoom:

1. The BIS logo — a small triangle. This is the Bureau of Indian Standards mark, and it certifies the piece was tested at a licensed assaying centre.
2. The purity grade in carat and fineness — for example 22K916, 18K750 or 14K585.
3. The 6-digit HUID — a mix of letters and numbers, unique to that single item.

If a piece shows only a manufacturer's logo, a vague "916" scratch, or the older four-symbol stamp without an HUID, it is not something a jeweller can sell you today. That alone is your first filter.

Cracking the purity code

The number next to the carat is not decoration. It is the fineness — the proportion of pure gold in the alloy, expressed per thousand.

• 916 = 22 karat = 91.6% pure gold. The most common choice for Indian jewellery.
• 750 = 18 karat = 75% pure. Harder, holds gemstones better, popular for studded and modern designs.
• 585 = 14 karat = 58.5% pure. More durable and cheaper, common in daily-wear and export pieces.

Hallmarking in India is permitted only for 14, 18, 20, 22, 23 and 24 karat gold. So if someone offers you a hallmarked "21K" bargain, something is off. Remember too that 24K is too soft for jewellery — pure gold bends easily, so anything you actually wear will be 22K or lower by design, not by cheating.

The 30-second check that protects you

Here is the part most buyers never use. The HUID is not just a stamp; it is a key into a national database, and you can open it yourself.

1. Install the BIS Care app from your phone's app store (it is official and free).
2. Open the Verify HUID option.
3. Enter the 6-digit code stamped on the piece.
4. Read what comes back: the jeweller's name and registration number, the purity, the type of article, and the hallmarking centre that tested it.

Now compare that screen against your bill and the item in your hand. The jeweller's name should match the shop. The purity should match what you are paying for. The article type — ring, chain, bangle — should match what you are holding. When all of it lines up, you are buying exactly what the price tag claims.

The red flags worth memorising

Fraud rarely looks dramatic. It looks like small mismatches you would shrug off if you weren't checking.

• No HUID at all, or a code that returns nothing in the app.
• App shows a lower purity than your bill — say 18K when you are paying 22K rates.
• The jeweller's name doesn't match the shop you are standing in (a sign the piece may be unaccounted stock).
• A heavily soldered or re-stamped area near the hallmark, suggesting the mark was moved from another item.
• Pressure to skip the check "because the machine is slow today."

A quiet but important point: the HUID certifies purity and traceability, not weight or making charges. Jewellers can still load the bill with high making charges or wastage. Hallmarking tells you the gold is real and as pure as claimed; negotiating the rest is still on you.

When you are selling, not buying

The system cuts both ways, and it helps sellers too. If your jewellery already carries a valid HUID, a buyer can verify its purity on the spot, which usually means a cleaner valuation and less haggling over "this looks like 20K to me."

If you own older pieces with the pre-2021 four-mark hallmark, don't panic — you are allowed to keep, wear and sell them to a jeweller. What's barred is a jeweller re-selling such items over the counter without re-hallmarking. Many will offer to get old jewellery re-assayed and stamped with a fresh HUID, which is worth doing before any big sale or insurance valuation.

For unhallmarked family gold, ask the jeweller to send it to a BIS-recognised hallmarking centre for testing. You will get a documented purity reading rather than a counter guess, and that paper trail matters the day you sell, pledge or pass it on.

Why this is worth the two minutes

Gold in India is rarely just an ornament. It is savings, collateral for a loan, a wedding gift, an inheritance. Every one of those uses depends on the metal being exactly as pure as everyone assumed — and for decades that assumption rested on trust alone.

The HUID doesn't replace your jeweller's reputation; it backs it with a number anyone can verify. Learn to find those six digits, learn what 916 and 750 mean, and keep the BIS Care app on your phone. The next time you buy, sell or simply wonder about a piece sitting in the locker, you won't be guessing. You'll know.